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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Respir+Res
2015 ; 16
(1
): 59
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gab.com Text
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English Wikipedia
Neutrophil extracellular trap (NET) formation characterises stable and
exacerbated COPD and correlates with airflow limitation
#MMPMID25994149
Grabcanovic-Musija F
; Obermayer A
; Stoiber W
; Krautgartner WD
; Steinbacher P
; Winterberg N
; Bathke AC
; Klappacher M
; Studnicka M
Respir Res
2015[May]; 16
(1
): 59
PMID25994149
show ga
BACKGROUND: COPD is a progressive disease of the airways that is characterized by
neutrophilic inflammation, a condition known to promote the excessive formation
of neutrophil extracellular traps (NETs). The presence of large amounts of NETs
has recently been demonstrated for a variety of inflammatory lung diseases
including cystic fibrosis, asthma and exacerbated COPD. OBJECTIVE: We test
whether excessive NET generation is restricted to exacerbation of COPD or whether
it also occurs during stable periods of the disease, and whether NET presence and
amount correlates with the severity of airflow limitation. PATIENTS, MATERIALS
AND METHODS: Sputum samples from four study groups were examined: COPD patients
during acute exacerbation, patients with stable disease, and smoking and
non-smoking controls without airflow limitation. Sputum induction followed the
ECLIPSE protocol. Confocal laser microscopy (CLSM) and electron microscopy were
used to analyse samples. Immunolabelling and fluorescent DNA staining were
applied to trace NETs and related marker proteins. CLSM specimens served for
quantitative evaluation. RESULTS: Sputum of COPD patients is clearly
characterised by NETs and NET-forming neutrophils. The presence of large amounts
of NET is associated with disease severity (p < 0.001): over 90 % in exacerbated
COPD, 45 % in stable COPD, and 25 % in smoking controls, but less than 5% in
non-smokers. Quantification of NET-covered areas in sputum preparations confirms
these results. CONCLUSIONS: NET formation is not confined to exacerbation but
also present in stable COPD and correlates with the severity of airflow
limitation. We infer that NETs are a major contributor to chronic inflammatory
and lung tissue damage in COPD.